linux-kernel - Re: [PATCH v1 15/39] mm/huge_memory: batch rmap operations in __split_huge_pmd

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Date: Fri, 15 Dec 2023 10:27:15 +0800
From: "Yin, Fengwei" <fengwei.yin@...el.com>
To: David Hildenbrand <david@...hat.com>, <linux-kernel@...r.kernel.org>
CC: <linux-mm@...ck.org>, Andrew Morton <akpm@...ux-foundation.org>, "Matthew
 Wilcox (Oracle)" <willy@...radead.org>, Hugh Dickins <hughd@...gle.com>, Ryan
 Roberts <ryan.roberts@....com>, Mike Kravetz <mike.kravetz@...cle.com>,
	Muchun Song <muchun.song@...ux.dev>, Peter Xu <peterx@...hat.com>
Subject: Re: [PATCH v1 15/39] mm/huge_memory: batch rmap operations in
 __split_huge_pmd_locked()



On 12/11/2023 11:56 PM, David Hildenbrand wrote:
> Let's use folio_add_anon_rmap_ptes(), batching the rmap operations.
> 
> While at it, use more folio operations (but only in the code branch we're
> touching), use VM_WARN_ON_FOLIO(), and pass RMAP_EXCLUSIVE instead of
> manually setting PageAnonExclusive.
> 
> We should never see non-anon pages on that branch: otherwise, the
> existing page_add_anon_rmap() call would have been flawed already.
> 
> Signed-off-by: David Hildenbrand <david@...hat.com>
Reviewed-by: Yin Fengwei <fengwei.yin@...el.com>